Low Temperature Butterfly Valve

Dafugui Low Temperature Butterfly Valves feature a soft seal, a butterfly structure, and a flange connection. They allow for bidirectional flow and are suitable for media such as mud and dust. We currently offer a full range of sizes and diameters to suit your needs. For further information or to customize butterfly valves suitable for low-temperature environments, please contact us for more details.

Product Parameters

Key Features

1. Cryogenic Sealing Guarantee: The main sealing surface of the Low Temperature Butterfly Valve utilizes a nickel-based alloy welding process, withstanding temperatures as low as -196℃. A two-stage sealing structure composed of bellows and graphite winding ensures a leakage rate of no more than 50ppm. The valve stem's dual sealing system, combined with a spring-reinforced stuffing box, meets vacuum-level sealing requirements. All valve seat components are made of low-temperature annealed stainless steel and have undergone intergranular corrosion testing to eliminate the risk of cold flow deformation.

2. Cryogenic Embrittlement Resistance Design: The valve body of the Low Temperature Butterfly Valve undergoes cryogenic austenitization stabilization treatment, and the butterfly plate is cryogenically machined with liquid nitrogen.

3. Wide Temperature Range Adaptability: The extended valve cover forms a cold insulation barrier, and with an optional vacuum jacket, thermal stability can be maintained at -100℃. The wedge-shaped self-tightening valve seat design ensures that the sealing pressure remains above 6.5 MPa even with temperature fluctuations, improving system reliability.

4. Typical Operating Condition Verification Record: Suitable for liquid nitrogen storage and transportation units and ethylene cryogenic separation units, it has demonstrated excellent stability through long-term industrial verification. 5. Special manufacturing process: Each Low Temperature Butterfly Valve undergoes 100 deep cryogenic cycle tests before leaving the factory to ensure consistent performance.

Instructions for Use

1. Pre-cooling Treatment: Before using the Low Temperature Butterfly Valve, it must be pre-cooled using a gradient method. First, purge the air with nitrogen and cool to the operating temperature at a rate of less than 30°C/hour. Direct introduction of cryogenic media is strictly prohibited to avoid cold cracking of the sealing surface.

2. Installation Direction Control: The medium flow direction marking on the valve body must be consistent with the pipeline flow direction. Reverse installation of a single-eccentric structure will increase the leakage rate by 10 times.

Maintenance Requirements

1. Regular Maintenance

It is recommended to perform bolt preload check every 3 months, bellows seal test every 12 months, and complete cryogenic cycle test every 2 years.

2. Emergency Maintenance

Immediate shutdown is required in the following situations:

* Frost buildup on valve body surface exceeds 30% of surface area

* Actuator malfunction delay exceeds 50% of standard value

* Stuffing gland leakage rate suddenly exceeds 1000 ppm